Manufacture of coherent bodies from blast-furnace dust.



' addition of bthefi binding materials. 'Th1s m isfofifidin the-h t UNITED STATES ii'liENT OFFICE.

, int-1mm zwmscnlne energe ics, .G -BMA usmsm unfi or eon-ensue 'WZDIES@QoifBLmsT-FUMAQE 'nus'r.

res Beets s lthe tieaiim mm ei :e q

irehouse-Furnace herenflbodies in the or'm "of briquets or; otherwise.

on, see amt of from blast oultis, partly; eat "fineness and partlyi ereentage; In b ri-j ihesfibeen the:

, whe v r eny nia'tei'ialis usedms a' binder;

g vfvhih is also txmtained in the bla tf-uma i esi'a'n "ingredient or impurity, j the ML in; immune sf sush binder-must not b gleafqnlmtlty'since otherwise the e m too? pementege;

ofdron 1n theb'riquetlwillwbecome so low as to'rendfthei' roduetworthle'ss. v

'lllast ifii'maee nest; "itself cntalus binding nifiterialls ofiafhydraul'ic char-J Iter. (such as hydranlic"-lizne or cement) hich *resnlt from the si'nteringin the heat "These binding mate- Y rials 'eni'ble the blast furiiacefliistin a,

many cases to 'hafclemhy itself without any,

est in rim-0e.

he'st degree with to 'an';

1. m b gcataly'tie ct 'ciell sur e of the 31:1 7 metals "salts r ms suchessn Tmiouned is the lr'lhterial-trges and estroyed entirely by long exposure? with? water and, bloeks" "or the like, will yea P em endin acids,

flhhloi'ie acid, late. wthettt; :Wmnenu Sent!- Dust, of

greatsteed ei these I mixtliie in each case being" was. seen 1 0432548.

1 mgredie'nts f the blast iron eontained these entalytie lgxliii'ed salts wit mace dust, such the z-thereim :The sddil'lionjgof agents muses the :blast iharden. snbstsntin llylikecement within a l iewh0lit"s, ,this firoeess b'ein often accomeriie'cl. byiafeonsixleiablefevo ution ef heat. j-l t willbe"wellsunderstood that these salts do Qnot .theniselvesterm any cempoun'ds which ant as uhinders "aria! d ree, but their action is chie y cata- -lytie,4: avt-is they determineend stimnlate thebinding action of the msterials eontained in the blast furnae dust. Thea'etion .of the several salts is not'thesamein ell eases with every blast furnace dust. The particular "salt, 0: mixture of saltsrund the amount of itto] used must be detemn'ned'by'ex er-imentin each individual ease. Thea ld 1tion of these eatalytiesgents varies from a free g-ti1)n,0f'1% toaheut-Aor For reasons pof monomy it is advisable-in n jany eases t use mixtures of salts such as are ebtainwl 'as' wasteprbducts inxeriow industries, such gas the potash industgg or the extrac-tionof {up fer, 'orthe nmnuteet'o we of a. l 0st" soluble, salts Ehave en 'advanta eons -,-i nfluenee' on the deadening eblastifurneseidustwhutt'ithez lorids of the .a-lkali es. have no action'whatever, and all .selts and compounds of strongly alkaline characterhave a detrimental action.

It will be understood that the blast furnace dust, or to ghlast furnace dust with salts, such as above adefined, other binding materials Such-ad- 'ditional binding materials shouldneverbe' of a strongly alkaline character, as this would impair the".eatalytic action of the {Isa-Its; Th s isthe' ressonrthetsnbstances sueh as ordinsryPortland cement should not be used, It centeins materials which will set free immediately or after a short time, considerable nantlties of hydrate of lime;- -11; all cases t erefor'e inwhich bindihgf atez'ials, eonteinin "lime are used, care shou d be taken to have t e blast furance dust set er hardened entirely, or for the greater art before the formation have obtained ood results with the addition of finely-p verized blast furnace slag of a. character whicheauses it slowly; Lheve also obtained good results by the admikture'of very fine quertz,-the then moistened as these fornithe re,

:for. themixture inen'y mates the to harden ifumaee dust .to'

of hydrate of lime.

with water, formed into briquets by pressure and then treated with steiun under pressure in a closed vessel. 'l n the first men lioncd case the lime which is set free as hydrate of lime by the hardenin action of the steam on the blast furnace ust, exerts a hardening effect on the slag, which contains only a small percenlnge of lime. In the second cuse this lime, which is set free by the action of the slcuni, combines with the quartz to form silicate of lime, which is u very ell'ectivcbiuder.

Instead of adding catalytic agents or salts to the blast furnace dust, I may obtain results similar in character, but not so good in degree, by warming or heating the finished products either in the open air, or by means of steam under pressure in a closed vessel. If the blast furnace dust itself has strong binding properties, other fine materials such as fine concentrates, pyritic waste, purple ore, etc. may be added, the blast furnace dust in this case serving as a binder.

It will of course be understood that I may carry out my process not only with the blast furnace dust obtained as a deposit in the l smelting of iron ores, but to blast furnace diist obtained from other metallurgical processes, such as the production of copper.

claim as my invention:

L'The herein described process of agglomemting blast furnace dust, which consists in nnxin such dust with an agent, which, by catalytic influence stimulates the binding action of ingredients contained in the blast furnace dust, and,then forming the mass into coherent bodies.

2. The herein described process of ag glmnornling blast furnace dust, which consisls in mixing such dust with an agent, which, by a catalytic infl stances contained in bodies.

3. The herein do scribed process of a glomcrnting blast furnace dust, which slsts in mixing suc material nnd with catalytic influence notion of ingredient into coherent bodies.

l. The herein de glomcrating blast furnace sis-ts H1 mixing such lei-nil and with lytic influence slimu of ingredients contained in the blast .furnac'e (lust, and then forming the mass 1 out bodies.

5. The herein do an -agent, which,

h dust an agent, which, I) stiinula with M181: and

i-ence slin'iulates the binding action of subuie blast furnace dust,

with other fine tes the bin ing s contained in the blast; lurnace dust, and then forming the mass scribed dust, which 00 process of egdust with a binding'maby a catabites the binding action scribed process of a nto coherglomerating blast furnace dust, .which consists in mixin such terial, and with other dition ada ted to be E the blast furnace dustyand wi by catalytic influence stim binder wit an agent \vhlch,

dust with binding 111 material in a fine cc lates the loindin action of ingredients co furnace dust, and then forming the mixture into coherent bodies.

mined in 'the b ast I n witness whereof I presence of two subseri my name in the witnesses.

Witnesses WomEMAn H agglomerated by such huve hereunto si ned ing WILHELM SCHUMAOHER. 

